NOCO Boost Plus GB40
The Jump Starter That Fits in Your Glove Box
A dead car battery always hits at the worst possible moment — a dark parking lot, pouring rain, or miles from help. The NOCO Boost Plus GB40 is a pocket-size jump starter that gets you going again in minutes, no second car required.
Usually $99.95. Price is approximate and may change.
Why we noticed it
A dead battery strands people constantly, and traditional jumper cables require a second car. The GB40 has been one of Amazon’s best-selling jump starters for years, with 100,000+ reviews and a strong average rating. Reviewers consistently mention how it turned a stressful situation into a non-event. Huge sales volume, high ratings, and years at the top of the category made it an obvious pick for a closer look.
What it does
The NOCO Boost Plus GB40 is a lithium-ion jump starter rated for gas engines up to 6.0L and diesel up to 3.0L. Clamp it to a dead battery and it delivers a surge of power to crank the engine. It’s got a rugged design with spark-proof technology and reverse polarity protection, so even if you hook the cables up wrong, it won’t damage the car. Beyond jump starting, it doubles as a USB power bank for charging phones and a 100-lumen LED flashlight with strobe and SOS modes. The GB40 holds its charge for up to a year, so you can leave it in your trunk without worrying.
What we like
- Genuinely pocketable — about the size of a paperback, small and light enough to live in a glove box or backpack.
- Starts real engines — rated for up to 6.0L gas and 3.0L diesel, covering most cars, SUVs, and light trucks.
- Built for mistakes — spark-proof tech and reverse polarity protection mean a wrong connection won’t fry your electronics.
- More than a jump starter — doubles as a USB power bank, with a 100-lumen LED flashlight for nighttime emergencies.
- Holds its charge — the lithium battery holds a charge for up to a year, so it’s ready when you need it.
The catch
- Not for big diesels — large diesel trucks beyond 3.0L need the bigger GB70 or GB150.
- Needs occasional top-ups — like any lithium battery it slowly self-discharges; check it every 6–12 months.
- Won’t resurrect a truly dead battery — if a battery can’t hold any charge at all, no jump starter will save it.
- Premium price — around $100 is more than basic jumper cables, but you’re paying for independence.
Who it’s for
Drivers who want peace of mind — commuters, road-trippers, parents of teen drivers, and anyone who’s been stranded before. If you drive an older car with an aging battery, this is cheap insurance. Skip it if you drive a large diesel truck (get the GB70) or you always have roadside assistance and never venture far.
Price and where to buy
How we evaluated it
We did not hands-on test the GB40. This review is researched and curated: we analyzed NOCO’s published specs, read through thousands of customer reviews for recurring praise and complaints, and compared it against competing jump starters on price, power, and safety features. Findings reflect aggregated buyer experience and published specifications, not a lab test.
3 alternatives
FAQ
Will it start my car?
For most gas cars, SUVs, and light trucks — yes. It’s rated for gas engines up to 6.0L and diesels up to 3.0L. Check your engine size against these ratings.
Is it safe if I connect the clamps wrong?
Yes — the UltraSafe system is spark-proof with reverse-polarity protection, so incorrect connections won’t damage your vehicle.
How often do I need to charge it?
NOCO recommends recharging every 6 months at minimum. We suggest every 3 months so it’s always ready when you need it.
Final verdict
For about $100, the GB40 is one of the easiest automotive recommendations we can make: a pocket-size insurance policy that turns a dead battery from a crisis into a minor inconvenience. It’s not the cheapest option, but the combination of power, safety features, and reliability justifies the price. Verdict: Worth it.
Would you buy this?
Affiliate disclosure: Product links are plain, non-affiliate links. Rbay Finds is not affiliated with eBay. Reviews are researched and curated; unless an article says otherwise, Rbay Finds has not purchased or first-hand tested the product.
Prices shown are approximate snapshots and can change on Amazon.
